[Plant antigens with immunological properties. II. Further studies of the chemical characteristics and immunological properties of a grass pollen extract].

This second study carried out on an extract of two grass pollens (Poa pratensis and Phleum pratense) demonstrated the presence of N-acetilglucosamine and sialic acid in the extract (RFEX). Moreover the extract has confirmed its characteristics biologic activity i.e. the inhibition of the phenomenon of immune hemolysis with a different technique too, even having the antibodies of the treated animals the complement fixing activity. No appreciable changes of the immunoelectrophoresis pattern in the serum of the immunized mice have been noticed.